﻿
/***************************************************************************************
Name: Client Javascript for ASP.NET 2.0 TreeView 
Description: ASP.NET 2.0 TreeView lack for client operation. This set of functions provide
some supports. Includes:
* get node
* change checkbox status of parent and child nodes

Author: Chuanzhuo
Date:   
Commonts:
***************************************************************************************/

function OnTreeNodeChecked(TreeViewID) {
    var element = element = window.event.srcElement;
    if (!IsCheckBox(element))
        return;
    var isChecked = element.checked;
    var tree = TV2_GetTreeById(TreeViewID);
    var node = TV2_GetNode(tree, element);
    TV2_SetChildNodesCheckStatus(node, isChecked);
    var parent = TV2_GetParentNode(tree, node);
    TV2_NodeOnChildNodeCheckedChanged(tree, parent, isChecked);
} 

//set child nodes checkbox status
function TV2_SetChildNodesCheckStatus(node, isChecked) {
    var childNodes = TV2i_GetChildNodesDiv(node);
    if (childNodes == null)
        return;

    var inputs = WebForm_GetElementsByTagName(childNodes, "INPUT");
    if (inputs == null || inputs.length == 0)
        return;

    for (var i = 0; i < inputs.length; i++) {
        if (IsCheckBox(inputs[i]))
            inputs[i].checked = isChecked;
    }
}

//change parent node checkbox status after child node changed
function TV2_NodeOnChildNodeCheckedChanged(tree, node, isChecked) {
    if (node == null)
        return;

    var childNodes = TV2_GetChildNodes(tree, node);

    if (childNodes == null || childNodes.length == 0)
        return;

    var isAllSame = true;

    for (var i = 0; i < childNodes.length; i++) {
        var item = childNodes[i];
        var value = TV2_NodeGetChecked(item);

        if (isChecked != value) {
            isAllSame = false;
            break;
        }
    }

    var parent = TV2_GetParentNode(tree, node);
    if (isAllSame) {
        TV2_NodeSetChecked(node, isChecked);
        TV2_NodeOnChildNodeCheckedChanged(tree, parent, isChecked);
    }
    else {
        TV2_NodeSetChecked(node, false);
        TV2_NodeOnChildNodeCheckedChanged(tree, parent, false);
    }
}

//get node relative element(etc. checkbox)
function TV2_GetNode(tree, element) {
    var id = element.id.replace(tree.id, "");
    id = id.toLowerCase().replace(element.type, "");
    id = tree.id + id;

    var node = document.getElementById(id);
    if (node == null) //leaf node, no "A" node
        return element;
    return node;
}

//get parent node
function TV2_GetParentNode(tree, node) {
    var div = WebForm_GetParentByTagName(node, "DIV");

    //The structure of node: <table>information of node</table><div>child nodes</div>
    var table = div.previousSibling;
    if (table == null)
        return null;

    return TV2i_GetNodeInElement(tree, table);
}

//get child nodes array
function TV2_GetChildNodes(tree, node) {
    if (TV2_NodeIsLeaf(node))
        return null;

    var children = new Array();
    var div = TV2i_GetChildNodesDiv(node);
    var index = 0;

    for (var i = 0; i < div.childNodes.length; i++) {
        var element = div.childNodes[i];
        if (element.tagName != "TABLE")
            continue;

        var child = TV2i_GetNodeInElement(tree, element);
        if (child != null)
            children[index++] = child;
    }
    return children;
}

function TV2_NodeIsLeaf(node) {
    return !(node.tagName == "A"); //Todo
}

function TV2_NodeGetChecked(node) {
    var checkbox = TV2i_NodeGetCheckBox(node);
    return checkbox.checked;
}

function TV2_NodeSetChecked(node, isChecked) {
    var checkbox = TV2i_NodeGetCheckBox(node);
    if (checkbox != null)
        checkbox.checked = isChecked;
}

function IsCheckBox(element) {
    if (element == null)
        return false;
    return (element.tagName == "INPUT" && element.type.toLowerCase() == "checkbox");
}

//get tree
function TV2_GetTreeById(id) {
    return document.getElementById(id);
}

//////////////////////////////////////////////////////////////////////////////////////////////
//private mothods, with TV2i_ prefix
//////////////////////////////////////////////////////////////////////////////////////////////

//get div contains child nodes
function TV2i_GetChildNodesDiv(node) {
    if (TV2_NodeIsLeaf(node))
        return null;

    var childNodsDivId = node.id + "Nodes";
    return document.getElementById(childNodsDivId);
}

//find node in element
function TV2i_GetNodeInElement(tree, element) {
    var node = TV2i_GetNodeInElementA(tree, element);
    if (node == null) {
        node = TV2i_GetNodeInElementInput(tree, element);
    }
    return node;
}

//find "A" node 
function TV2i_GetNodeInElementA(tree, element) {
    var as = WebForm_GetElementsByTagName(element, "A");
    if (as == null || as.length == 0)
        return null;

    var regexp = new RegExp("^" + tree.id + "n\\d+$");

    for (var i = 0; i < as.length; i++) {
        if (as[i].id.match(regexp)) {
            return as[i];
        }
    }
    return null;
}

//find "INPUT" node
function TV2i_GetNodeInElementInput(tree, element) {
    var as = WebForm_GetElementsByTagName(element, "INPUT");
    if (as == null || as.length == 0)
        return null;

    var regexp = new RegExp("^" + tree.id + "n\\d+");

    for (var i = 0; i < as.length; i++) {
        if (as[i].id.match(regexp)) {
            return as[i];
        }
    }
    return null;
}

//get checkbox of node
function TV2i_NodeGetCheckBox(node) {
    if (IsCheckBox(node))
        return node;

    var id = node.id + "CheckBox";
    return document.getElementById(id);
}
